Event Subscription Method, Apparatus, and System

5. The event subscription method of claim 1, wherein the first type is a loss of connectivity event, wherein the event subscription method further comprises determining, by the user data management network element, the updated first duration and a second duration of a first timer based on the second time parameter, wherein the second time parameter comprises a maximum latency, wherein the event parameter information further comprises the second duration, and wherein the second duration is for subscribing to the first event.

6. The event subscription method of claim 1, wherein the first message further comprises a first maximum response time, wherein the second type is the UE reachability event, wherein the second message further comprises a second maximum response time greater than the first maximum response time, and wherein the event parameter information further comprises the second maximum response time.

7. The event subscription method of claim 1, wherein the first message further comprises a first suggested quantity of downlink packets, wherein the second type is the UE reachability event, wherein the second message further comprises a second suggested quantity of downlink packets greater than the first suggested quantity, and wherein the event parameter information further comprises the second suggested quantity.

12. The event subscription system of claim 8, wherein the first message further carries a first maximum response time, wherein the second type is the UE reachability event, wherein the second message further comprises a second maximum response time greater than the first maximum response time, and wherein the event parameter information further comprises the second maximum response time.

13. The event subscription system of claim 8, wherein the first message further carries a first suggested quantity of downlink packets for a network element to buffer when the UE is unreachable, wherein the second type is the UE reachability event, wherein the second message further comprises a second suggested quantity of downlink packets for the network element to buffer when the UE is unreachable, wherein the second suggested quantity is greater than the first suggested quantity of downlink packets, and wherein the event parameter information further comprises the second suggested quantity of downlink packets.

15. The apparatus of claim 14, wherein the first message further carries a first maximum response time, wherein the second type is the UE reachability event, wherein the second message further comprises a second maximum response time greater than the first maximum response time, and wherein the event parameter information further comprises the second maximum response time.

16. The apparatus of claim 14, wherein the first message further carries a first suggested quantity of downlink packets, wherein the second type is the UE reachability event, wherein the second message further comprises a second suggested quantity of downlink packets greater than the first suggested quantity of downlink packets, and wherein the event parameter information further comprises the second suggested quantity of downlink packets.

17. The apparatus of claim 14, wherein the first type is a loss of connectivity event, wherein the processor is configured to execute the instructions to further cause the apparatus to determine a second duration of a first timer, wherein the event parameter information further comprises the second duration, and wherein the second duration is used for subscribing to the first event.

19. The event subscription method of claim 18, wherein the first message further carries a first maximum response time, wherein the second type is the UE reachability event, wherein the second message further comprises a second maximum response time greater than the first maximum response time, and wherein the event parameter information further comprises the second maximum response time.

20. The event subscription method of claim 18, wherein the first message further carries a first suggested quantity of downlink packets, wherein the second type is the UE reachability event, wherein the second message further comprises a second suggested quantity of downlink packets greater than the first suggested quantity of downlink packets, and wherein the event parameter information further comprises the second suggested quantity of downlink packets.